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This article in AJ

  1. Vol. 62 No. 6, p. 821-824
     
    Received: May 19, 1970
    Published: Nov, 1970


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doi:10.2134/agronj1970.00021962006200060044x

2-Chloro-6-(Trichloromethyl) Pyridine as a Nitrification Inhibitor for Anhydrous Ammonia Applied in Different Seasons1

  1. T. D. Hughes and
  2. L. F. Welch2

Abstract

Abstract

Field experiments were conducted to study the effects of 2-chloro-6-(trichloromethyl) pyridine, N-Serve, on nitrification of anhydrous NH3. Applications of 0, 0.56, and 1.12 kg N-Serve/ha in all possible combinations with 0, 112, and 224 kg N/ha were made on March 30, June 4, and November 25, 1968. Concentrations of NH4+-N in the NH3 retention zones were determined at various times following application.

N-Serve decreased the rate of nitrification. Nitrification inhibition was evident at the first sampling (14 to 41 days from NH3 application) and persisted until almost all NH4+ had nitrified. N-Serve was inhibitory at all locations within the NH3 retention zone. As an average of all application dates and N rates, there was 52% as much NH4+ present at the first sampling with no N-Serve as with 1.12 kg/ha of N-Serve. There was 82% as much NH4+ present at the first sampling with 0.56 kg/ha N-Serve as with 1.12 kg/ha N-Serve.

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